Liftin' heads

How to make it go fast

Moderators: Greenleaf, KTA, BC847, Richie O

Re: Liftin' heads

Postby RCCUMMINS89 » Wed Feb 03, 2016 9:06 pm

They have higher pressure. Duration aside, the higher you inject the pressure, the quicker the cloud point, the less timing needed (even pure duration). This is one reason why cr trucks are in the negatives for timing in some aspects.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
RCCUMMINS89
14mm rotor
 
Posts: 4826
Joined: Mon Oct 03, 2011 4:19 pm
Location: Spirit Lake, ID

Re: Liftin' heads

Postby DMan1198 » Thu Feb 04, 2016 7:02 pm

That's because they have pilot injection. If you reduce pilot without adjusting main timing power is noticeably affected (a 40% reduction in pilot is noticeable) cutting pilot without adjusting makes it run like garbage (undrivable really) I ran my 6.7 at 5* minimum when I first went back to a single event tune with my s480. I'm up to 7* minimum now, but I have a near 30* sweep in timing from idle to 4300rpm. Pressure does make a huge difference though. 2000psi more pressure allows for timing to be pulled 2-4 degrees in the top end generally speaking.
Ducati- professional nap taker, and thread derailer extraordinaire
Brownie: 80 dodge heavy half. Ghost cummins under the hood, and some sinister plans
The Roo Hunter: 93 w250, lifted, 2 whistle machines, and a bunch of other go fast goodies, uhh..... not there yet
Jaeger: 12 ram 3500. Lifted, exhausted, and fed an excessive quantity of air
The Huntress: 02 Jetta TDI. No muffler, egr, horsepower
DMan1198
14mm rotor
 
Posts: 2254
Joined: Sat Aug 10, 2013 6:26 am
Location: Slave Lake, Alberta

Re: Liftin' heads

Postby spencerdiesel » Fri Feb 05, 2016 5:59 am

Thanks guys. At what revs does a VE reach full advance?
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 6x10 VCO sticks, THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw 2 turns in, timing to the head/ >1/4”
Muffler delete

Minimum 60% WMO full time since Sep. 2018
spencerdiesel
14mm rotor
 
Posts: 1106
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
Top

Re: Liftin' heads

Postby RCCUMMINS89 » Sat Feb 06, 2016 8:52 pm

Stock form..... about 2200rpm.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
RCCUMMINS89
14mm rotor
 
Posts: 4826
Joined: Mon Oct 03, 2011 4:19 pm
Location: Spirit Lake, ID
Top

Re: Liftin' heads

Postby spencerdiesel » Fri Feb 12, 2016 8:00 pm

Thanks. If advance/mechanism/stuff is stock, would the extra 4 deg from the spacer mean that the previous full advance will be around 2200, and the added time from the spacer will come a few hundred revs after 2200?
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 6x10 VCO sticks, THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw 2 turns in, timing to the head/ >1/4”
Muffler delete

Minimum 60% WMO full time since Sep. 2018
spencerdiesel
14mm rotor
 
Posts: 1106
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
Top

Re: Liftin' heads

Postby spencerdiesel » Fri Feb 12, 2016 8:01 pm

Or is it purely case pressure that decides full advance revs, and it would still be 2200 with the spacer?
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 6x10 VCO sticks, THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw 2 turns in, timing to the head/ >1/4”
Muffler delete

Minimum 60% WMO full time since Sep. 2018
spencerdiesel
14mm rotor
 
Posts: 1106
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
Top

Re: Liftin' heads

Postby spencerdiesel » Wed Dec 05, 2018 6:52 pm

With whats in my sig, is a skipped tooth a death sentence for my untouched HG?

At 3/16" advanced, running WMO still wants more timing I think.
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 6x10 VCO sticks, THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw 2 turns in, timing to the head/ >1/4”
Muffler delete

Minimum 60% WMO full time since Sep. 2018
spencerdiesel
14mm rotor
 
Posts: 1106
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
Top

Re: Liftin' heads

Postby PToombs » Thu Dec 06, 2018 5:26 pm

Maybe not, because the WMO burns slower. It doesn't pop like fuel so there isn't as much pressure. Just MO though.
pete

Just enough power to break everything behind the crankshaft.
User avatar
PToombs
14mm rotor
 
Posts: 11367
Joined: Sun Jan 07, 2007 6:13 pm
Location: Syracuse NY. Snow central!
Top

Re: Liftin' heads

Postby spencerdiesel » Thu Dec 06, 2018 6:08 pm

That would be nice Pete, another thing I was going by loosely is how loud the engine is at idle.

3/16" bumped running 60/20/20 oil/gas/diesel is still quieter than stock timing on pure diesel.

Then again, with more BTU in the oil, the truck also pulls a wee bit harder. So many variables.

Does (*should*) the head always come off the block to properly stud a 12v?
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 6x10 VCO sticks, THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw 2 turns in, timing to the head/ >1/4”
Muffler delete

Minimum 60% WMO full time since Sep. 2018
spencerdiesel
14mm rotor
 
Posts: 1106
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
Top

Re: Liftin' heads

Postby PToombs » Fri Dec 07, 2018 5:28 pm

IMO that's the best way. Deck the head, new gasket, bottom tap the holes and clean them out good. I knew I was going to end up with compounds so when I had the timing way up and it quit weeping and started leaking at the front corner I did it all, studs, o-rings, decked, the whole nine.
pete

Just enough power to break everything behind the crankshaft.
User avatar
PToombs
14mm rotor
 
Posts: 11367
Joined: Sun Jan 07, 2007 6:13 pm
Location: Syracuse NY. Snow central!
Top

Re: Liftin' heads

Postby spencerdiesel » Fri Dec 07, 2018 10:45 pm

Makes sense. I can't invision myself making time to pull the head willingly....guess Ill split the timing difference: jump a tooth and put the pump 1/16" retarded from stock.
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 6x10 VCO sticks, THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw 2 turns in, timing to the head/ >1/4”
Muffler delete

Minimum 60% WMO full time since Sep. 2018
spencerdiesel
14mm rotor
 
Posts: 1106
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
Top

Re: Liftin' heads

Postby DMan1198 » Tue Dec 25, 2018 9:02 am

My mess was at 50psi, and 73psi of drive pressure for about a year until the trans died without any hg problems. Timing just to the head, and fairly small injectors. Part of it was driving style I like to think.

I studded my 6.7 1 at a time without pulling the head. If the gasket isn’t currently compromised that’s one of the best ways to do it imo, since the factory seal is about the best you’ll ever get.
Ducati- professional nap taker, and thread derailer extraordinaire
Brownie: 80 dodge heavy half. Ghost cummins under the hood, and some sinister plans
The Roo Hunter: 93 w250, lifted, 2 whistle machines, and a bunch of other go fast goodies, uhh..... not there yet
Jaeger: 12 ram 3500. Lifted, exhausted, and fed an excessive quantity of air
The Huntress: 02 Jetta TDI. No muffler, egr, horsepower
DMan1198
14mm rotor
 
Posts: 2254
Joined: Sat Aug 10, 2013 6:26 am
Location: Slave Lake, Alberta
Top

Re: Liftin' heads

Postby spencerdiesel » Tue Dec 25, 2018 8:14 pm

Dman I really like the idea of studs one at a time. I imagine its pull a bolt, install & torque stud, install and torque nut? In the same pattern you would torque the bolts?
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

H1C/18

Fuel: THD 6x10 VCO sticks, THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw 2 turns in, timing to the head/ >1/4”
Muffler delete

Minimum 60% WMO full time since Sep. 2018
spencerdiesel
14mm rotor
 
Posts: 1106
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
Top

Re: Liftin' heads

Postby fatty » Tue Dec 25, 2018 9:50 pm

That's what I did on mine. Worked just fine even with 50 psi and timing to the head.
91.5 w250
fatty
14mm rotor
 
Posts: 802
Joined: Tue Nov 04, 2008 8:52 pm
Location: Washington
Top

Re: Liftin' heads

Postby PToombs » Wed Dec 26, 2018 5:37 pm

Never torque the stud! The stud is supposed to float in the block, that's why the instructions say to bottom tap, so you get the most clean threads in the hole. If the stud is bottomed out and torqued into the block, if it breaks you can't get it out because it is tight to the bottom. You will have to burn it out or drill so the stud is almost gone to get it out.
pete

Just enough power to break everything behind the crankshaft.
User avatar
PToombs
14mm rotor
 
Posts: 11367
Joined: Sun Jan 07, 2007 6:13 pm
Location: Syracuse NY. Snow central!
Top

PreviousNext

Return to The good stuff

Who is online

Users browsing this forum: No registered users and 16 guests

cron